KR910002063B1 - Information recording corrier - Google Patents

Abstract

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Description

Information recording medium

1 is an exploded perspective view partially showing an information recording medium according to the present invention.

2 is a longitudinal sectional view of the information recording medium shown in FIG.

3 is a partial perspective view of the information recording medium shown in FIG.

4 is a perspective view showing, in cross section, a preformat data recording portion of an information recording medium according to the present invention;

5 is a cross-sectional perspective view showing a preformat data recording portion of another type of information recording medium according to the present invention.

* Explanation of symbols for the main parts of the drawings

10: optical disc 11: first disc

12: second disc 13: rotation hole

14: information recording layer 14a: address recording area,

15: inner spacer 16: outer spacer

17: internal air layer 20: connection spacer

110: first disk 120: second disk

140: recording layer 140a: address recording area

G: Home L: Land

P: pit.

The present invention relates to an information recording medium capable of recording information at high density, such as an optical disc or a video disc.

In the conventional information recording medium, a so-called air-sandwich medium has been disclosed in U.S. Patent No. 4,428,42 (Patent Junior et al.). The information recording medium includes two discs each formed of a transparent plastic substrate. Consists of. Here, the optical information recording layer composed of the energy absorbing layer or the light reflection layer is formed directly on one surface of each disk. Since each disk is opposed to each other, the recording layer is located between the two disks.

Since both disks are bonded with an adhesive through a concentric inner spacer and an outer spacer interposed therebetween, an air space is formed between the two disks. However, the disk of the conventional information recording medium must be formed with a relatively thin thickness, because the recording / reading laser beam must pass through the disk without distortion. In other words, the use of a thin disk prevents the loss of beam energy or the refraction of light beams as the laser beam passes through the disk.

However, there is a problem in that the material to be used cannot be freely selected due to the requirements of the thickness and transparency of the disk. Therefore, when air or gas expands or contracts in the space between the disks due to changes in ambient temperature or pressure, The information recording medium is bent or undulated by its expansion or contraction. This expansion or contraction prevents the recording / reading laser beam from focusing and thus lacks precision in processing the information stored on the recording layer. In extreme cases, the information recording medium and the optical head may come into contact with each other to process stored information.

An improved information recording medium is disclosed in US Pat. No. 45,648,502 (patent owner: Odawara), which solves the above problem, which is a first disc and a first disc for reinforcing the first disc. And a second disk located coaxially adjacent to the second disk.

In this configuration, a first spacer for forming an air layer between both disks while fixedly connecting both disks is located between the first and second disks, while on the surface of either the first disk or the second disk between the air layers. A recording layer is formed, and a second spacer is disposed between the first and second discs while being arranged radially from the first spacer.

The second spacer causes the disk to move in a radial direction when at least one of the disks is to be expanded or contracted due to a change in temperature, humidity, air pressure, or the like. Therefore, the disk is not bent or undulated by the change in temperature or air pressure.

However, there is another problem with the improved information recording medium. That is, since an air layer is formed along the entire surface between the recording layer and the first and second discs, the information recording medium becomes excessively thick, and further, the first and second spacers for fixedly connecting the first and second discs. Of the second and second discs tend to peel off from the spacers.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an information recording medium having higher durability and higher durability in order to securely bond a spacer and a disk.

The present invention for achieving the above object, the first disk member having an opposing side, the second disk member having an opposing side and positioned coaxially adjacent to the first disk member, the first And is installed between the first and second disk members to fix the second disk member and fixedly connected between the first and second disk members to fix the first and second disk members. And a first spaced member for forming an air layer between the surfaces of the second disk member opposed to each other, and formed on an opposing surface of one of the disk members of the two disk members facing the air layer between the two disk members. A recording layer comprising a recording layer and a pre-format data recording area of the recording layer on the surface of the Emitter consists equipped with a second spacing member which is to be matched to the surface of the recording area.

In the present invention having the above configuration, the first spacing member is preferably configured to include an annular inner spacer and an outer spacer bonded between the first and second disk members. In addition, it is preferable to include an adhesive means for adhering the second spacer member to the inner and outer spacers.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 and 3 show the structure of the information recording medium according to the present invention, wherein the optical disc 10 includes a first disc 11 and a second disc 12 made of a transparent synthetic resin material such as polycarbonate resin. The first and second disks 11 and 12 have an outer diameter of about 130 mm (5.25 inch) and a rotation hole 13 having a diameter of about 15 mm is drilled at the center of rotation thereof. These disks 11 and 12 are each formed to a thickness of 1 to 2 mm.

In addition, the annular information recording layer 14 is formed by depositing a metal such as tellurium (Te) on the surfaces of the first and second discs 11 and 12, as shown in FIG. On the recording layer 14, a plurality of grooves G are formed spirally or concentrically along the circumferential direction of the disks 11 and 12, and a plurality of land areas L (land, hereinafter referred to as land) are formed. The land L acts as a track for recording address data and information data using a laser beam thereon.

On the land L in the address recording area 14a, address data composed of a plurality of gangs P; is recorded as pre-formatted data by the laser beam, respectively. Such address data is made up of, for example, a track number and a sector number on the information recording layer 14, and is preformatted by a CAV (angular velocity constant) method. In the case of the CAN method, the number of sectors per track is the same on the inner or outer periphery of the recording layer 14 because the formatting is performed on a constant basis with each speed. The sectors on the track are located on the same angle. For this reason, on the optical disc, an address recording area 14a including a sector on which address data is recorded is arranged while being extended from the inner circumferential side.

The data in the recording layer 14 is recorded by drilling the land P along the land L using, for example, a laser beam generated from a semiconductor laser. At the time of reproduction, the recording data is reproduced by detecting the laser beam transmitted light or the reflected light from the semiconductor laser irradiating the recording layer 14.

On the other hand, the annular inner spacer 15 and outer spacer 16 having a thickness of 0.5 mm to 1 mm are disposed concentrically and adhered to the first disk 11 and the second disk 12 as first and second spacers. Will be. Furthermore, the address recording area 14a is adhered by the connection spacer 20 having the same thickness as the inner spacer 15 and the outer spacer 16 and acting as a third spacer. The optical disk 10 of the air-sandwich structure is provided with the sector type internal air layer 17 which is equal to the thickness of the inter-surface spacer 20 of the surface. In this case, two ends of the connection spacer 20 are connected to the inner spacer 15 and the outer spacer 16 and all the spacers are bonded to each other.

For this reason, the adhesion area between the first and second discs 11 and 12 becomes wider, thereby improving the adhesive strength. At the same time, the disk is designed so that the space between the first and second disks 11 and 12 is kept constant so that the disk is not deformed by external pressure or bending.

The optical disk 10 of the air-sandwich structure is composed of two disks, and data is recorded on one side of each disk. The disks are formatted in a CAV manner before the optical disk 10 is assembled and completed. After the data is recorded, the two disks are completed by adhering to each other via the inner spacer 15, the outer spacer 16, and the connecting spacer 20. As a result, the two recording layers 14 are adhered to each other through the connection spacer 20, thereby eliminating problems such as data in the address recording layer 14a being damaged or recording areas being reduced.

Next, a method of assembling the optical disc 10 will be described.

In FIG. 1, the recording layer 14 is positioned on one side of the second disk 12, and then one side 15a of the inner spacer 15 is bonded to the outer circumferential side of the rotation hole 13, One side 16a of the outer spacer 16 is bonded to the outer circumferential side of the second disk 12.

Furthermore, one side 20a of each connection spacer 20 and the address recording area 14a of the recording layer 14 are matched with each other and bonded together. At this time, one end portion 20c and the other end portion 20d of the connection spacer 20 are bound to the inner spacer 15 and the outer spacer 16, respectively. Here, it is preferable that the binding portion is bonded with an adhesive.

On the other hand, on the address recording area 14a of the recording layer 14, address data is pre-recorded using the laser beam as shown in FIG.

Next, the recording layer 14 of the first disk 11 is positioned to face the disk 12 side, and the rotation hole 13 is matched with the inner spacer 15 described above, and the outer circumferential portion thereof has the outer spacer ( 16). Further, the address recording area 14a is matched with the connection spacer 20, and the first disk 11 is then adhered to the exposed surfaces 15b, 16b, and 20b of the spacers 15, 16, and 20 described above. .

As a result, the first and second disks 11 and 12 are bonded to each other through the inner spacer 15, the outer spacer 16, and the connecting spacer 20, where the optical disk 10 having the air sandwich structure is provided. Is completed with a structure having a sector type internal air layer 17 that is equal to the thickness of the inner shaft spacer 15, the outer spacer 16, and the connection spacer 20.

As described above, the first and second disks are bonded to each other through a connection spacer that connects the inner and outer spacers in the address recording area. That is, the optical disk is designed to bond the first and second disks by using the inner spacers and the outer spacers connected by the radially located connecting spacers. By this means, the adhesive area is increased by increasing the bonding area. It is possible to implement an air-sandwich structure and an optical disk, which can prevent the optical disk from peeling off due to the weak adhesive strength. In addition, it is possible to implement an optical disc capable of withstanding deformation such as warpage and preventing the recording layer from being damaged by mutual contact between the recording layers due to external pressure.

Furthermore, since the surface of the recording area and the surface of the connection spacer are firmly adhered to each other with an adhesive, unnecessary formation of pit for any external cause is prevented by the adhesive. Therefore, the address data in the already recorded state is protected, that is, the damage of the address data and the loss of data are prevented.

In the above embodiment, the inner spacer, the outer spacer, and the connecting spacer are formed to be separated from each other. However, the spacers formed of the single spacer may be bonded to each other by forming them as a single spacer. Furthermore, the first and second disks 110 and 120 formatted in the address recording area 140a as shown in FIG. 5 may be bonded to each other, i.e., preformat data as address data is obtained from such a disk. After forming a plurality of gangs on the surface of the disk (110, 120), the recording layer 140 is coated on the disk (110, 120).

On the other hand, in the above embodiment, although the address data is recorded on the land L in the address recording area 14a as shown in FIG. 4, such address data may be recorded on the groove G. In the above embodiment, polycarbonate resin is used, but such a synthetic resin may be used such as polymethylmethacrylate or epoxy.

The present invention may also be applied to an optical disc in which an information recording layer is provided only on either one of the first disc and the second disc, and both discs may be contacted using the address recording layer of the information recording layer.

According to the present invention described above, since the adhesive strength is improved to withstand deformation due to external factors, it is possible to implement an information recording medium having improved durability.

Claims (8)

The first disk member 111 is formed on both sides, the second disk member 12 is formed on both sides, and is coaxially adjacent to the first disk member 11, and the disk members 11, 12. An information recording medium comprising first spacing members 15 and 16 for fixedly connecting both disk members 11 and 12 while forming an air layer 17 between the opposing surfaces of 12). Pre-format data recording areas 14a and 140a which are formed on opposite surfaces of any one of the first and second disc members 11 and 12 exposed in the air layer 17 and on which the pre-format data is recorded. Recording layers (14, 140); And a second spacing member (20) which is matched on the preformat data recording areas (14a, 140a) of the recording layers (14, 140). The method of claim 1, wherein the first spacing member comprises an annular inner spacer 15 and an outer spacer 16 bonded between the first and second disk members 11 and 12. Information recording medium. 3. The information recording medium according to claim 2, wherein an adhesive means for adhering the second spacer member to the inner spacers and the outer spacers is provided. 2. The preformat data recording area (14a, 140a) according to claim 1, characterized in that the preformat data recording area (14a, 140a) includes a metal layer extending on the disk member at any position of the recording layers (14,140) defined at a predetermined angle. Information recording medium. A first disc member 11 having a double side, a second disc member 12 having a double side and positioned coaxially adjacent to the first disc member 11, and the disc members 11, 12. An information recording medium comprising a first spacing member 15, 16 for fixedly connecting both disk members 11, 12 while forming an air layer 17 between the opposing surfaces of 12). (17) Recording layers 14 formed on opposite surfaces of the respective disk members 11 and 12 exposed in (17), and having preformat data recording areas 14a and 140a on which preformat data is recorded. , 140 and surfaces of the respective preformat data recording areas 14a and 140a for bonding the preformat data recording areas 14a and 140a of the first and second disc members 11 and 12 to each other. And a second spacing member 20 to be matched with the The information recording medium as a. 6. The method of claim 5, wherein the first spacing member comprises an annular inner spacer 15 and an outer spacer 16 which are bonded between the first and second disk members 11 and 12. Information recording medium. 7. An information recording medium according to claim 6, wherein an adhesive means for adhering said second spacer member (20) to said inner spacer (15) and said outer spacer (16) is provided. 6. The preformat data recording area (14a, 140a) according to claim 5, characterized in that the preformat data recording area (14a, 140a) includes a metal layer extending on the disk member at any position of the recording layers (14,140) defined at a predetermined angle. Information recording medium.

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